Instead of using core/snapshot_creator.rs, instead two crates are
introduced which allow building the snapshot during build.rs.
Rollup is removed and replaced with our own bundler. This removes
the Node build dependency. Modules in //js now use Deno-style imports
with file extensions, rather than Node style extensionless imports.
This improves incremental build time when changes are made to //js files
by about 40 seconds.
Because many Reader/Writer implementations (e.g. bufio) assume their
able to use subarray() with byte indexes and often ask for byte values,
it makes sense to simply restrict all implementations to Uint8Array.
